proto: generate structs for 0.34 and 0.37

Modify proto-compiler to generate protobuf modules for both versions
of the Tendermint protocol. The different versions are disambiguated
by module paths, presently tendermint::v0_34 and tendermint::v0_37,
with the latest supported version reimported as tendermint::*.

proto/src/prost/tendermint.consensus.rs → proto/src/prost/v0_34/tendermint.consensus.rs

@@ -140,7 +140,7 @@ pub struct MsgInfo {
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct TimeoutInfo {
     #[prost(message, optional, tag="1")]
-    pub duration: ::core::option::Option<super::super::google::protobuf::Duration>,
+    pub duration: ::core::option::Option<crate::google::protobuf::Duration>,
     #[prost(int64, tag="2")]
     pub height: i64,
     #[prost(int32, tag="3")]
@@ -178,7 +178,7 @@ pub mod wal_message {
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct TimedWalMessage {
     #[prost(message, optional, tag="1")]
-    pub time: ::core::option::Option<super::super::google::protobuf::Timestamp>,
+    pub time: ::core::option::Option<crate::google::protobuf::Timestamp>,
     #[prost(message, optional, tag="2")]
     pub msg: ::core::option::Option<WalMessage>,
 }

proto/src/prost/tendermint.state.rs → proto/src/prost/v0_34/tendermint.state.rs

@@ -55,7 +55,7 @@ pub struct State {
     #[prost(message, optional, tag="4")]
     pub last_block_id: ::core::option::Option<super::types::BlockId>,
     #[prost(message, optional, tag="5")]
-    pub last_block_time: ::core::option::Option<super::super::google::protobuf::Timestamp>,
+    pub last_block_time: ::core::option::Option<crate::google::protobuf::Timestamp>,
     /// LastValidators is used to validate block.LastCommit.
     /// Validators are persisted to the database separately every time they change,
     /// so we can query for historical validator sets.